Hi all,
I just find some strange device (at least to me) on my Sun Blade server, CP3060, like below:
bash-3.00# cd /dev/dsk
bash-3.00# ls c3*
c3t600A0B80002FA5F50000000000000000d0s0 c3t600A0B80002FA60C0000000000000000d0s4
c3t600A0B80002FA5F50000000000000000d0s1 c3t600A0B80002FA60C0000000000000000d0s5
....
And there are total 40 similar ones. Also some IO can be seen on them with "iostat -xnct".
Could anyone please can tell me what kind of disk thy are and what the name meaning is?
That huge number is a worldwide number, sort of like a MAC but for disks. In your case, it looks like it's 4 partitions on the one disk (controller 3, target 6, LUN 0)
The fact that it's controller 3 suggests what incredible is saying - that it's external.
These long target names are device GUIDs like the ones described in the scsi_vhci manual page.
AFAIK, they represent disks remotely connected through a fiberchannel or network attachment (SAN).
For the case that this is still of interest to you:
these device names, indeed refer to external storage. I guess it could be something like STK Flexline (see A0B80 in the device's name).
If you have root privileges just invoke the format utility. That should, for each external device, display the storage system's name in human readable format.
Also, it seems that mpxio is enabled on that system, otherwise the device names should be shorter.
You also may want to invoke
"cfgadm -alo show_SCSI_LUN"
to determine the corresponding LUN numbers of those devices. This command would also show the controller numbers which are being used to connect to the external storage. In case of mpxio being enabled "c3" usually is a logical device only, which physically consists of c1 + c2 or so.
